Transaction not yet indexed

668UNLnLbWS3tpTzpWkx28Qo2Cdb7Ebnu49hyf8AjbDZZBYZdQX75CeFsaYaDSGSoifdgDiT4YQddpzSS4aj4jmu

The transaction signature is valid but not yet indexed by this RPC node, or the transaction failed before inclusion.